EP1526703A1 - Vorrichtung und Verfahren zur gemeinsamen Benutzung einer IP Adresse - Google Patents

Vorrichtung und Verfahren zur gemeinsamen Benutzung einer IP Adresse Download PDF

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Publication number
EP1526703A1
EP1526703A1 EP04292473A EP04292473A EP1526703A1 EP 1526703 A1 EP1526703 A1 EP 1526703A1 EP 04292473 A EP04292473 A EP 04292473A EP 04292473 A EP04292473 A EP 04292473A EP 1526703 A1 EP1526703 A1 EP 1526703A1
Authority
EP
European Patent Office
Prior art keywords
routing
local network
interface
network
address
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04292473A
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English (en)
French (fr)
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EP1526703B1 (de
Inventor
Jean-Denis Boyer
Eric Beaudoin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MEDIA5 CORPORATION
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Mediatrix Telecom Inc
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Filing date
Publication date
Application filed by Mediatrix Telecom Inc filed Critical Mediatrix Telecom Inc
Publication of EP1526703A1 publication Critical patent/EP1526703A1/de
Application granted granted Critical
Publication of EP1526703B1 publication Critical patent/EP1526703B1/de
Not-in-force legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H04L12/2869—Operational details of access network equipments
    • H04L12/2898—Subscriber equipments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/04—Interdomain routing, e.g. hierarchical routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming

Definitions

  • the present invention relates to sharing of an IP address. More specifically, the present invention is concerned with a routing system and method for sharing of an IP address.
  • IP Internet protocol
  • IPv4 Internet .Protocol Version 4
  • a well known solution to such a type of problems includes using a router that acts as a Network Address Translator (NAT) between a local network, such as a Local Area Network (LAN), and a larger network, such as a Wide Area Network (WAN), as described in Srisuresh, P., « IP Network Address Translator (NAT) Terminology and Considerations » RFC 2663, August 1999, for example.
  • the NAT uses a public IPv4 address to allow a set of devices located on nodes within the LAN to communicate with nodes of the WAN.
  • private IPv4 addresses are allocated to each device, usually by Dynamic Host Configuration Protocol (DHCP).
  • DHCP Dynamic Host Configuration Protocol
  • the NAT When a packet of data is sent to the WAN, the NAT translates the private source address into a public address and saves a corresponding data flow as a new connection.
  • the NAT identifies it to a corresponding data flow, and translates the public address destination into the private address of a device it is destined for in the LAN.
  • the NAT modifies the IPv4 addressing, and takes special care of protocols such as UDP (User Data Protocol) and TCP (Transmission Control Protocol) to avoid port conflicts; it may further have to translate port numbers.
  • NAT based systems and methods are efficient in cases when there are a number of nodes in the local LAN.
  • solutions based on using a NAT allow an increased security by hiding nodes on the LAN, wherein the nodes behind the NAT using a private IPv4 address are unreachable from a node on the WAN, and packets of data pass through the NAT and are forwarded to the LAN only if a communication, initiated from the LAN, exists.
  • NAT based systems and methods may be limited by the limited number of private IP addresses available as mentioned hereinabove, by an available range of port numbers and by the proper performance of the router acting as a NAT.
  • the nodes on the LAN ignore the real public IPv4 address. This is a problem when registering to a public server (the Session Initiation Protocol (SIP) is an example), whereby the IPv4 address is copied into the protocol data and thus the NAT is unable to translate it.
  • SIP Session Initiation Protocol
  • the nodes on the LAN cannot easily offer public services, in particular in the cases of server applications that listen to specific ports, since the NAT needs to know these specific server ports to allow connections to be initiated from the WAN.
  • NAT's may further require specific translation agents such as Application Level Gateways (ALG) for certain protocols, in the case of special translation performed by the NAT for specific application level protocols.
  • ALG Application Level Gateways
  • the NAT may not be the best solution, due to its complexity and aforementioned disadvantages.
  • a routing method for connecting at least one device of a local network to a large network comprising the steps of providing at least one routing device hosting an application and comprising a first interface to the large network and a second interface to the local network; and connecting the at least one network device to the second interface of the at least one routing device; whereby the at least one routing device shares an Internet Protocol address between the application it is hosting and the at least one network device.
  • a routing system for at least one local network device that requires connections to a large network through using an Internet protocol address, comprising at least one routing device hosting an application and having a first interface to the large network and a second interface to the local network, the at least one routing device sharing an Internet protocol address between the application it is hosting and the at least one local network device.
  • Figure 1 is a general schematic view of a system according to the present invention
  • Figure 2 illustrates a first application of a system according to the present invention
  • Figure 3 illustrates a second application of a system according to the present invention.
  • Figure 4 illustrates a third application of a system according to the present invention.
  • the present invention provides a routing system and method allowing sharing a public IP address, such as a public IPv4 (Internet Protocol Version 4) address for example, between an application hosted on the routing device and a node of a local network.
  • a public IP address such as a public IPv4 (Internet Protocol Version 4) address for example
  • the routing device 10 generally comprises an Internet Protocol interface 12 to connect to a large network such as a WAN, and an Internet Protocol interface 14 to connect to a device 16 of a local network such as a LAN.
  • the IP interface 12 to the large network is assigned a public IP address, such as an IPv4 address, by an ISP, either by a DHCP negotiation (see for example Droms, R., « Dynamic Host Configuration Protocol » RFC 2131, March 1997), by establishing a point-to-point link (PPP), or by any other mechanism depending on a type of link between the routing device 10 and the large network 12, as is well known in the art.
  • a public IP address such as an IPv4 address
  • the IP interface to the local network 14 is assigned a private IP address, such as a private IPv4 address for example, as known in the art (see for example Rekhter, Y., « Address Allocation for Local Internets » RFC 1918, February 1996).
  • This private IP address of the IP interface to the local network 14 is statically configured and allows the device 16 on the local network 14 to communicate with the routing device 10, which would otherwise be impossible since both share a same public IPv4 address, as will be described further hereinbelow.
  • the device 16 on the local network 14 is assigned the same public IPv4 address as the routing device 10, by using DHCP, and is related to a subnet mask the same as the one assigned by the ISP. Alternatively, if this is not available, such as in the case of a PPP connection for instance, predefined subnet classes are used.
  • the device 16 may be a router for example.
  • the routing device 10 performs transparent routing as described in the art (see for example Smoot, C-M., « Using ARP to implement Transparent Subnet Gateways » RFC 1027, October 1987), by forwarding to the large network any packet of data sent to any IP address that is included in the large subnet.
  • a default router assigned to the device 16 on the local network 14 may be any IP address included in the subnet, excluding the one IP address bound thereto of course.
  • Each packet of data received from the large network, destined for the IP public address, is forwarded directly to the network device 16 on the local network 14, except if it belongs to an existing connection used by the hosted application, or to a server port currently opened. Reversely, each IP packet received from the local network 14 is forwarded to the large network side, except for packets sent explicitly to a private address of the routing device 10.
  • the routing device 10 may initiate a communication with the device 16 on the local network 14, by using its private IP address as a source address.
  • the device 16 on the local network 14 is bound to the public IP address of the routing device 10, the device 16 knows the real public address that is to be used by other nodes of the large network to reach it, without recurring to an ALG for example.
  • the present invention therefore simplifies offer of public services, since the device 16 on the local network may easily open server ports, without the need to inform the routing device 10, providing the device 16 does not use the same server ports as the application hosted on the routing device 10, as already mentioned.
  • the routing device of the present invention is generally less complex that existing systems, since there is no need to register connections that the device does not own, allowing faster routing decisions with less memory resources.
  • device. 16 connected on interface 14 can be a routing device that in turns connects to other devices 16 with additional interfaces.
  • a firewall may be used, which may either reside on the device 16 on the LAN 12 or be integrated to the routing device 10 logic.
  • Figure 2 illustrates an exemplary application of the device of the present invention for offering VolP (voice over internet protocol) or telephony services over the Internet in a residential installation, wherein a routing device 10 with analog phone ports and an embedded telephony application is connected directly to the WAN 12 for allowing a personal computer 16 to be transparently connected to the Internet.
  • VolP Voice over internet protocol
  • routing device of the present invention for local network devices that require connections to the public Internet through the use of an IPv4 address, such as for example alarm systems (see Figure 3), vending machines (see Figure 4), etc.
  • a number of routing devices 10 may be serially connected one to each other, thereby sharing a same IP address in a daisy chain fashion.
  • a number of IP enabled vending machines in a remote location may be connected serially to a single DSL (digital subscriber line) modem for stock management and security control.
  • DSL digital subscriber line
  • a further embodiment of the present invention may allow sharing one IP address among several devices connected in parallel, by providing separate physical interfaces (one for each device), wherein each interface defines a LAN of its own, and each connection is registered by the routing device. A physically detached local subnet may then be created to allow the devices on the multiple LANs to communicate with each other.
  • the present invention also relates to a routing method for sharing a public IP address such as a public IPv4 address, which comprises providing a routing device hosting an application and provided with an interface to a large network such as a WAN and an interface to a local network such as a LAN, providing a network device in the local network, connecting the network device to the LAN interface of the routing device, whereby the routing device shares a public IP, such as a public IPv4 address between the application it is hosting and the network device.
  • a routing method for sharing a public IP address such as a public IPv4 address

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
EP04292473A 2003-10-24 2004-10-18 Vorrichtung und Verfahren zur gemeinsamen Benutzung einer IP Adresse Not-in-force EP1526703B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51355603P 2003-10-24 2003-10-24
US513556P 2003-10-24

Publications (2)

Publication Number Publication Date
EP1526703A1 true EP1526703A1 (de) 2005-04-27
EP1526703B1 EP1526703B1 (de) 2008-07-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04292473A Not-in-force EP1526703B1 (de) 2003-10-24 2004-10-18 Vorrichtung und Verfahren zur gemeinsamen Benutzung einer IP Adresse

Country Status (5)

Country Link
US (1) US20050089025A1 (de)
EP (1) EP1526703B1 (de)
AT (1) ATE401734T1 (de)
CA (1) CA2485002A1 (de)
DE (1) DE602004015040D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1779255A2 (de) * 2004-08-16 2007-05-02 i2Telecom International, Inc. System und verfahren zur gemeinsamen benutzung einer ip-adresse
WO2007144214A1 (de) * 2006-06-12 2007-12-21 Siemens Aktiengesellschaft Verfahren und vorrichtung zum vermitteln von datenpaketen zwischen mobilen nutzerterminals und einem mobilfunknetz

Families Citing this family (9)

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WO2004107131A2 (en) * 2003-05-28 2004-12-09 Caymas Systems, Inc. Policy based network address translation
KR100603562B1 (ko) * 2004-05-14 2006-07-24 삼성전자주식회사 브이오아이피 음성 처리 장치 및 그 방법
US7443880B2 (en) * 2004-06-25 2008-10-28 Cisco Technology, Inc. Arrangement for reaching IPv4 public network nodes by a node in a IPv4 private network via an IPv6 access network
US7639686B2 (en) * 2005-04-07 2009-12-29 Cisco Technology, Inc. Access network clusterhead for providing local mobility management of a roaming IPv4 node
US7411967B2 (en) * 2005-05-06 2008-08-12 Cisco Technology, Inc. Private network gateways interconnecting private networks via an access network
US7903585B2 (en) * 2006-02-15 2011-03-08 Cisco Technology, Inc. Topology discovery of a private network
US8588742B2 (en) * 2007-03-16 2013-11-19 Ericsson Ab Method and apparatus for providing wireless services to mobile subscribers using existing broadband infrastructure
US8806033B1 (en) * 2011-06-30 2014-08-12 Juniper Networks, Inc. Effective network identity pairing
JP5765474B1 (ja) * 2014-09-24 2015-08-19 富士ゼロックス株式会社 情報処理装置及び情報処理プログラム

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EP1017206A2 (de) * 1998-12-30 2000-07-05 Nortel Networks Corporation Verfahren und Vorrichtung zum Anschluss eines Hausnetzwerks ans Internet
EP1085728A2 (de) * 1999-09-14 2001-03-21 Aiwa Co., Ltd. Übertragungsendgerät zur Datenübertragung zwischen einem Netzwerk und Rechnern und Datenübertragungsverfahren zur Verwendung dieses Gerätes
EP1187426A2 (de) * 2000-09-08 2002-03-13 Samsung Electronics Co., Ltd. Verfahren zum Benutzen einer eindeutigen Netzadresse in einer Domäne von privaten IP Adressen
US20020046404A1 (en) * 2000-10-13 2002-04-18 Kenji Mizutani Remote accessible programming

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Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
EP1017206A2 (de) * 1998-12-30 2000-07-05 Nortel Networks Corporation Verfahren und Vorrichtung zum Anschluss eines Hausnetzwerks ans Internet
EP1085728A2 (de) * 1999-09-14 2001-03-21 Aiwa Co., Ltd. Übertragungsendgerät zur Datenübertragung zwischen einem Netzwerk und Rechnern und Datenübertragungsverfahren zur Verwendung dieses Gerätes
EP1187426A2 (de) * 2000-09-08 2002-03-13 Samsung Electronics Co., Ltd. Verfahren zum Benutzen einer eindeutigen Netzadresse in einer Domäne von privaten IP Adressen
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1779255A2 (de) * 2004-08-16 2007-05-02 i2Telecom International, Inc. System und verfahren zur gemeinsamen benutzung einer ip-adresse
EP1779255A4 (de) * 2004-08-16 2010-06-02 I2Telecom International Inc System und verfahren zur gemeinsamen benutzung einer ip-adresse
WO2007144214A1 (de) * 2006-06-12 2007-12-21 Siemens Aktiengesellschaft Verfahren und vorrichtung zum vermitteln von datenpaketen zwischen mobilen nutzerterminals und einem mobilfunknetz

Also Published As

Publication number Publication date
EP1526703B1 (de) 2008-07-16
ATE401734T1 (de) 2008-08-15
DE602004015040D1 (de) 2008-08-28
CA2485002A1 (en) 2005-04-24
US20050089025A1 (en) 2005-04-28

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